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comparison mupdf-source/thirdparty/tesseract/src/ccmain/tesseractclass.cpp @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 ///////////////////////////////////////////////////////////////////////
2 // File: tesseractclass.cpp
3 // Description: The Tesseract class. It holds/owns everything needed
4 // to run Tesseract on a single language, and also a set of
5 // sub-Tesseracts to run sub-languages. For thread safety, *every*
6 // variable that was previously global or static (except for
7 // constant data, and some visual debugging flags) has been moved
8 // in here, directly, or indirectly.
9 // This makes it safe to run multiple Tesseracts in different
10 // threads in parallel, and keeps the different language
11 // instances separate.
12 // Some global functions remain, but they are isolated re-entrant
13 // functions that operate on their arguments. Functions that work
14 // on variable data have been moved to an appropriate class based
15 // mostly on the directory hierarchy. For more information see
16 // slide 6 of "2ArchitectureAndDataStructures" in
17 // https://drive.google.com/file/d/0B7l10Bj_LprhbUlIUFlCdGtDYkE/edit?usp=sharing
18 // Some global data and related functions still exist in the
19 // training-related code, but they don't interfere with normal
20 // recognition operation.
21 // Author: Ray Smith
22 //
23 // (C) Copyright 2008, Google Inc.
24 // Licensed under the Apache License, Version 2.0 (the "License");
25 // you may not use this file except in compliance with the License.
26 // You may obtain a copy of the License at
27 // http://www.apache.org/licenses/LICENSE-2.0
28 // Unless required by applicable law or agreed to in writing, software
29 // distributed under the License is distributed on an "AS IS" BASIS,
30 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
31 // See the License for the specific language governing permissions and
32 // limitations under the License.
33 //
34 ///////////////////////////////////////////////////////////////////////
35
36 // Include automatically generated configuration file if running autoconf.
37 #ifdef HAVE_CONFIG_H
38 # include "config_auto.h"
39 #endif
40
41 #include "tesseractclass.h"
42
43 #include <allheaders.h>
44 #include "edgblob.h"
45 #ifndef DISABLED_LEGACY_ENGINE
46 # include "equationdetect.h"
47 #endif
48 #include "lstmrecognizer.h"
49 #include "thresholder.h" // for ThresholdMethod
50
51 namespace tesseract {
52
53 Tesseract::Tesseract()
54 : BOOL_MEMBER(tessedit_resegment_from_boxes, false,
55 "Take segmentation and labeling from box file", this->params())
56 , BOOL_MEMBER(tessedit_resegment_from_line_boxes, false,
57 "Conversion of word/line box file to char box file", this->params())
58 , BOOL_MEMBER(tessedit_train_from_boxes, false, "Generate training data from boxed chars",
59 this->params())
60 , BOOL_MEMBER(tessedit_make_boxes_from_boxes, false, "Generate more boxes from boxed chars",
61 this->params())
62 , BOOL_MEMBER(tessedit_train_line_recognizer, false,
63 "Break input into lines and remap boxes if present", this->params())
64 , BOOL_MEMBER(tessedit_dump_pageseg_images, false,
65 "Dump intermediate images made during page segmentation", this->params())
66 // TODO: remove deprecated tessedit_do_invert in release 6.
67 , BOOL_MEMBER(tessedit_do_invert, true,
68 "Try inverted line image if necessary (deprecated, will be "
69 "removed in release 6, use the 'invert_threshold' parameter instead)",
70 this->params())
71 , double_MEMBER(invert_threshold, 0.7,
72 "For lines with a mean confidence below this value, OCR is also tried with an inverted image",
73 this->params())
74 ,
75 // The default for pageseg_mode is the old behaviour, so as not to
76 // upset anything that relies on that.
77 INT_MEMBER(tessedit_pageseg_mode, PSM_SINGLE_BLOCK,
78 "Page seg mode: 0=osd only, 1=auto+osd, 2=auto_only, 3=auto, "
79 "4=column,"
80 " 5=block_vert, 6=block, 7=line, 8=word, 9=word_circle, 10=char,"
81 "11=sparse_text, 12=sparse_text+osd, 13=raw_line"
82 " (Values from PageSegMode enum in tesseract/publictypes.h)",
83 this->params())
84 , INT_MEMBER(thresholding_method,
85 static_cast<int>(ThresholdMethod::Otsu),
86 "Thresholding method: 0 = Otsu, 1 = LeptonicaOtsu, 2 = "
87 "Sauvola",
88 this->params())
89 , BOOL_MEMBER(thresholding_debug, false,
90 "Debug the thresholding process",
91 this->params())
92 , double_MEMBER(thresholding_window_size, 0.33,
93 "Window size for measuring local statistics (to be "
94 "multiplied by image DPI). "
95 "This parameter is used by the Sauvola thresholding method",
96 this->params())
97 , double_MEMBER(thresholding_kfactor, 0.34,
98 "Factor for reducing threshold due to variance. "
99 "This parameter is used by the Sauvola thresholding method."
100 " Normal range: 0.2-0.5",
101 this->params())
102 , double_MEMBER(thresholding_tile_size, 0.33,
103 "Desired tile size (to be multiplied by image DPI). "
104 "This parameter is used by the LeptonicaOtsu thresholding "
105 "method",
106 this->params())
107 , double_MEMBER(thresholding_smooth_kernel_size, 0.0,
108 "Size of convolution kernel applied to threshold array "
109 "(to be multiplied by image DPI). Use 0 for no smoothing. "
110 "This parameter is used by the LeptonicaOtsu thresholding "
111 "method",
112 this->params())
113 , double_MEMBER(thresholding_score_fraction, 0.1,
114 "Fraction of the max Otsu score. "
115 "This parameter is used by the LeptonicaOtsu thresholding "
116 "method. "
117 "For standard Otsu use 0.0, otherwise 0.1 is recommended",
118 this->params())
119 , INT_INIT_MEMBER(tessedit_ocr_engine_mode, tesseract::OEM_DEFAULT,
120 "Which OCR engine(s) to run (Tesseract, LSTM, both)."
121 " Defaults to loading and running the most accurate"
122 " available.",
123 this->params())
124 , STRING_MEMBER(tessedit_char_blacklist, "", "Blacklist of chars not to recognize",
125 this->params())
126 , STRING_MEMBER(tessedit_char_whitelist, "", "Whitelist of chars to recognize", this->params())
127 , STRING_MEMBER(tessedit_char_unblacklist, "",
128 "List of chars to override tessedit_char_blacklist", this->params())
129 , BOOL_MEMBER(tessedit_ambigs_training, false, "Perform training for ambiguities",
130 this->params())
131 , INT_MEMBER(pageseg_devanagari_split_strategy, tesseract::ShiroRekhaSplitter::NO_SPLIT,
132 "Whether to use the top-line splitting process for Devanagari "
133 "documents while performing page-segmentation.",
134 this->params())
135 , INT_MEMBER(ocr_devanagari_split_strategy, tesseract::ShiroRekhaSplitter::NO_SPLIT,
136 "Whether to use the top-line splitting process for Devanagari "
137 "documents while performing ocr.",
138 this->params())
139 , STRING_MEMBER(tessedit_write_params_to_file, "", "Write all parameters to the given file.",
140 this->params())
141 , BOOL_MEMBER(tessedit_adaption_debug, false,
142 "Generate and print debug"
143 " information for adaption",
144 this->params())
145 , INT_MEMBER(bidi_debug, 0, "Debug level for BiDi", this->params())
146 , INT_MEMBER(applybox_debug, 1, "Debug level", this->params())
147 , INT_MEMBER(applybox_page, 0, "Page number to apply boxes from", this->params())
148 , STRING_MEMBER(applybox_exposure_pattern, ".exp",
149 "Exposure value follows"
150 " this pattern in the image filename. The name of the image"
151 " files are expected to be in the form"
152 " [lang].[fontname].exp[num].tif",
153 this->params())
154 , BOOL_MEMBER(applybox_learn_chars_and_char_frags_mode, false,
155 "Learn both character fragments (as is done in the"
156 " special low exposure mode) as well as unfragmented"
157 " characters.",
158 this->params())
159 , BOOL_MEMBER(applybox_learn_ngrams_mode, false,
160 "Each bounding box"
161 " is assumed to contain ngrams. Only learn the ngrams"
162 " whose outlines overlap horizontally.",
163 this->params())
164 , BOOL_MEMBER(tessedit_display_outwords, false, "Draw output words", this->params())
165 , BOOL_MEMBER(tessedit_dump_choices, false, "Dump char choices", this->params())
166 , BOOL_MEMBER(tessedit_timing_debug, false, "Print timing stats", this->params())
167 , BOOL_MEMBER(tessedit_fix_fuzzy_spaces, true, "Try to improve fuzzy spaces", this->params())
168 , BOOL_MEMBER(tessedit_unrej_any_wd, false, "Don't bother with word plausibility",
169 this->params())
170 , BOOL_MEMBER(tessedit_fix_hyphens, true, "Crunch double hyphens?", this->params())
171 , BOOL_MEMBER(tessedit_enable_doc_dict, true, "Add words to the document dictionary",
172 this->params())
173 , BOOL_MEMBER(tessedit_debug_fonts, false, "Output font info per char", this->params())
174 , INT_MEMBER(tessedit_font_id, 0, "Font ID to use or zero", this->params())
175 , BOOL_MEMBER(tessedit_debug_block_rejection, false, "Block and Row stats", this->params())
176 , BOOL_MEMBER(tessedit_enable_bigram_correction, true,
177 "Enable correction based on the word bigram dictionary.", this->params())
178 , BOOL_MEMBER(tessedit_enable_dict_correction, false,
179 "Enable single word correction based on the dictionary.", this->params())
180 , INT_MEMBER(tessedit_bigram_debug, 0, "Amount of debug output for bigram correction.",
181 this->params())
182 , BOOL_MEMBER(enable_noise_removal, true,
183 "Remove and conditionally reassign small outlines when they"
184 " confuse layout analysis, determining diacritics vs noise",
185 this->params())
186 , INT_MEMBER(debug_noise_removal, 0, "Debug reassignment of small outlines", this->params())
187 ,
188 // Worst (min) certainty, for which a diacritic is allowed to make the
189 // base
190 // character worse and still be included.
191 double_MEMBER(noise_cert_basechar, -8.0, "Hingepoint for base char certainty", this->params())
192 ,
193 // Worst (min) certainty, for which a non-overlapping diacritic is allowed
194 // to make the base character worse and still be included.
195 double_MEMBER(noise_cert_disjoint, -1.0, "Hingepoint for disjoint certainty", this->params())
196 ,
197 // Worst (min) certainty, for which a diacritic is allowed to make a new
198 // stand-alone blob.
199 double_MEMBER(noise_cert_punc, -3.0, "Threshold for new punc char certainty", this->params())
200 ,
201 // Factor of certainty margin for adding diacritics to not count as worse.
202 double_MEMBER(noise_cert_factor, 0.375, "Scaling on certainty diff from Hingepoint",
203 this->params())
204 , INT_MEMBER(noise_maxperblob, 8, "Max diacritics to apply to a blob", this->params())
205 , INT_MEMBER(noise_maxperword, 16, "Max diacritics to apply to a word", this->params())
206 , INT_MEMBER(debug_x_ht_level, 0, "Reestimate debug", this->params())
207 , STRING_MEMBER(chs_leading_punct, "('`\"", "Leading punctuation", this->params())
208 , STRING_MEMBER(chs_trailing_punct1, ").,;:?!", "1st Trailing punctuation", this->params())
209 , STRING_MEMBER(chs_trailing_punct2, ")'`\"", "2nd Trailing punctuation", this->params())
210 , double_MEMBER(quality_rej_pc, 0.08, "good_quality_doc lte rejection limit", this->params())
211 , double_MEMBER(quality_blob_pc, 0.0, "good_quality_doc gte good blobs limit", this->params())
212 , double_MEMBER(quality_outline_pc, 1.0, "good_quality_doc lte outline error limit",
213 this->params())
214 , double_MEMBER(quality_char_pc, 0.95, "good_quality_doc gte good char limit", this->params())
215 , INT_MEMBER(quality_min_initial_alphas_reqd, 2, "alphas in a good word", this->params())
216 , INT_MEMBER(tessedit_tess_adaption_mode, 0x27, "Adaptation decision algorithm for tess",
217 this->params())
218 , BOOL_MEMBER(tessedit_minimal_rej_pass1, false, "Do minimal rejection on pass 1 output",
219 this->params())
220 , BOOL_MEMBER(tessedit_test_adaption, false, "Test adaption criteria", this->params())
221 , BOOL_MEMBER(test_pt, false, "Test for point", this->params())
222 , double_MEMBER(test_pt_x, 99999.99, "xcoord", this->params())
223 , double_MEMBER(test_pt_y, 99999.99, "ycoord", this->params())
224 , INT_MEMBER(multilang_debug_level, 0, "Print multilang debug info.", this->params())
225 , INT_MEMBER(paragraph_debug_level, 0, "Print paragraph debug info.", this->params())
226 , BOOL_MEMBER(paragraph_text_based, true,
227 "Run paragraph detection on the post-text-recognition "
228 "(more accurate)",
229 this->params())
230 , BOOL_MEMBER(lstm_use_matrix, 1, "Use ratings matrix/beam search with lstm", this->params())
231 , STRING_MEMBER(outlines_odd, "%| ", "Non standard number of outlines", this->params())
232 , STRING_MEMBER(outlines_2, "ij!?%\":;", "Non standard number of outlines", this->params())
233 , BOOL_MEMBER(tessedit_good_quality_unrej, true, "Reduce rejection on good docs",
234 this->params())
235 , BOOL_MEMBER(tessedit_use_reject_spaces, true, "Reject spaces?", this->params())
236 , double_MEMBER(tessedit_reject_doc_percent, 65.00, "%rej allowed before rej whole doc",
237 this->params())
238 , double_MEMBER(tessedit_reject_block_percent, 45.00, "%rej allowed before rej whole block",
239 this->params())
240 , double_MEMBER(tessedit_reject_row_percent, 40.00, "%rej allowed before rej whole row",
241 this->params())
242 , double_MEMBER(tessedit_whole_wd_rej_row_percent, 70.00,
243 "Number of row rejects in whole word rejects"
244 " which prevents whole row rejection",
245 this->params())
246 , BOOL_MEMBER(tessedit_preserve_blk_rej_perfect_wds, true,
247 "Only rej partially rejected words in block rejection", this->params())
248 , BOOL_MEMBER(tessedit_preserve_row_rej_perfect_wds, true,
249 "Only rej partially rejected words in row rejection", this->params())
250 , BOOL_MEMBER(tessedit_dont_blkrej_good_wds, false, "Use word segmentation quality metric",
251 this->params())
252 , BOOL_MEMBER(tessedit_dont_rowrej_good_wds, false, "Use word segmentation quality metric",
253 this->params())
254 , INT_MEMBER(tessedit_preserve_min_wd_len, 2, "Only preserve wds longer than this",
255 this->params())
256 , BOOL_MEMBER(tessedit_row_rej_good_docs, true, "Apply row rejection to good docs",
257 this->params())
258 , double_MEMBER(tessedit_good_doc_still_rowrej_wd, 1.1,
259 "rej good doc wd if more than this fraction rejected", this->params())
260 , BOOL_MEMBER(tessedit_reject_bad_qual_wds, true, "Reject all bad quality wds", this->params())
261 , BOOL_MEMBER(tessedit_debug_doc_rejection, false, "Page stats", this->params())
262 , BOOL_MEMBER(tessedit_debug_quality_metrics, false, "Output data to debug file",
263 this->params())
264 , BOOL_MEMBER(bland_unrej, false, "unrej potential with no checks", this->params())
265 , double_MEMBER(quality_rowrej_pc, 1.1, "good_quality_doc gte good char limit", this->params())
266 , BOOL_MEMBER(unlv_tilde_crunching, false, "Mark v.bad words for tilde crunch", this->params())
267 , BOOL_MEMBER(hocr_font_info, false, "Add font info to hocr output", this->params())
268 , BOOL_MEMBER(hocr_char_boxes, false, "Add coordinates for each character to hocr output",
269 this->params())
270 , BOOL_MEMBER(crunch_early_merge_tess_fails, true, "Before word crunch?", this->params())
271 , BOOL_MEMBER(crunch_early_convert_bad_unlv_chs, false, "Take out ~^ early?", this->params())
272 , double_MEMBER(crunch_terrible_rating, 80.0, "crunch rating lt this", this->params())
273 , BOOL_MEMBER(crunch_terrible_garbage, true, "As it says", this->params())
274 , double_MEMBER(crunch_poor_garbage_cert, -9.0, "crunch garbage cert lt this", this->params())
275 , double_MEMBER(crunch_poor_garbage_rate, 60, "crunch garbage rating lt this", this->params())
276 , double_MEMBER(crunch_pot_poor_rate, 40, "POTENTIAL crunch rating lt this", this->params())
277 , double_MEMBER(crunch_pot_poor_cert, -8.0, "POTENTIAL crunch cert lt this", this->params())
278 , double_MEMBER(crunch_del_rating, 60, "POTENTIAL crunch rating lt this", this->params())
279 , double_MEMBER(crunch_del_cert, -10.0, "POTENTIAL crunch cert lt this", this->params())
280 , double_MEMBER(crunch_del_min_ht, 0.7, "Del if word ht lt xht x this", this->params())
281 , double_MEMBER(crunch_del_max_ht, 3.0, "Del if word ht gt xht x this", this->params())
282 , double_MEMBER(crunch_del_min_width, 3.0, "Del if word width lt xht x this", this->params())
283 , double_MEMBER(crunch_del_high_word, 1.5, "Del if word gt xht x this above bl", this->params())
284 , double_MEMBER(crunch_del_low_word, 0.5, "Del if word gt xht x this below bl", this->params())
285 , double_MEMBER(crunch_small_outlines_size, 0.6, "Small if lt xht x this", this->params())
286 , INT_MEMBER(crunch_rating_max, 10, "For adj length in rating per ch", this->params())
287 , INT_MEMBER(crunch_pot_indicators, 1, "How many potential indicators needed", this->params())
288 , BOOL_MEMBER(crunch_leave_ok_strings, true, "Don't touch sensible strings", this->params())
289 , BOOL_MEMBER(crunch_accept_ok, true, "Use acceptability in okstring", this->params())
290 , BOOL_MEMBER(crunch_leave_accept_strings, false, "Don't pot crunch sensible strings",
291 this->params())
292 , BOOL_MEMBER(crunch_include_numerals, false, "Fiddle alpha figures", this->params())
293 , INT_MEMBER(crunch_leave_lc_strings, 4, "Don't crunch words with long lower case strings",
294 this->params())
295 , INT_MEMBER(crunch_leave_uc_strings, 4, "Don't crunch words with long lower case strings",
296 this->params())
297 , INT_MEMBER(crunch_long_repetitions, 3, "Crunch words with long repetitions", this->params())
298 , INT_MEMBER(crunch_debug, 0, "As it says", this->params())
299 , INT_MEMBER(fixsp_non_noise_limit, 1, "How many non-noise blbs either side?", this->params())
300 , double_MEMBER(fixsp_small_outlines_size, 0.28, "Small if lt xht x this", this->params())
301 , BOOL_MEMBER(tessedit_prefer_joined_punct, false, "Reward punctuation joins", this->params())
302 , INT_MEMBER(fixsp_done_mode, 1, "What constitutes done for spacing", this->params())
303 , INT_MEMBER(debug_fix_space_level, 0, "Contextual fixspace debug", this->params())
304 , STRING_MEMBER(numeric_punctuation, ".,", "Punct. chs expected WITHIN numbers", this->params())
305 , INT_MEMBER(x_ht_acceptance_tolerance, 8,
306 "Max allowed deviation of blob top outside of font data", this->params())
307 , INT_MEMBER(x_ht_min_change, 8, "Min change in xht before actually trying it", this->params())
308 , INT_MEMBER(superscript_debug, 0, "Debug level for sub & superscript fixer", this->params())
309 , double_MEMBER(superscript_worse_certainty, 2.0,
310 "How many times worse "
311 "certainty does a superscript position glyph need to be for "
312 "us to try classifying it as a char with a different "
313 "baseline?",
314 this->params())
315 , double_MEMBER(superscript_bettered_certainty, 0.97,
316 "What reduction in "
317 "badness do we think sufficient to choose a superscript "
318 "over what we'd thought. For example, a value of 0.6 means "
319 "we want to reduce badness of certainty by at least 40%",
320 this->params())
321 , double_MEMBER(superscript_scaledown_ratio, 0.4,
322 "A superscript scaled down more than this is unbelievably "
323 "small. For example, 0.3 means we expect the font size to "
324 "be no smaller than 30% of the text line font size.",
325 this->params())
326 , double_MEMBER(subscript_max_y_top, 0.5,
327 "Maximum top of a character measured as a multiple of "
328 "x-height above the baseline for us to reconsider whether "
329 "it's a subscript.",
330 this->params())
331 , double_MEMBER(superscript_min_y_bottom, 0.3,
332 "Minimum bottom of a character measured as a multiple of "
333 "x-height above the baseline for us to reconsider whether "
334 "it's a superscript.",
335 this->params())
336 , BOOL_MEMBER(tessedit_write_block_separators, false, "Write block separators in output",
337 this->params())
338 , BOOL_MEMBER(tessedit_write_rep_codes, false, "Write repetition char code", this->params())
339 , BOOL_MEMBER(tessedit_write_unlv, false, "Write .unlv output file", this->params())
340 , BOOL_MEMBER(tessedit_create_txt, false, "Write .txt output file", this->params())
341 , BOOL_MEMBER(tessedit_create_hocr, false, "Write .html hOCR output file", this->params())
342 , BOOL_MEMBER(tessedit_create_alto, false, "Write .xml ALTO file", this->params())
343 , BOOL_MEMBER(tessedit_create_page_xml, false, "Write .page.xml PAGE file", this->params())
344 , BOOL_MEMBER(page_xml_polygon, true, "Create the PAGE file with polygons instead of box values", this->params())
345 , INT_MEMBER(page_xml_level, 0, "Create the PAGE file on 0=line or 1=word level.", this->params())
346 , BOOL_MEMBER(tessedit_create_lstmbox, false, "Write .box file for LSTM training",
347 this->params())
348 , BOOL_MEMBER(tessedit_create_tsv, false, "Write .tsv output file", this->params())
349 , BOOL_MEMBER(tessedit_create_wordstrbox, false, "Write WordStr format .box output file",
350 this->params())
351 , BOOL_MEMBER(tessedit_create_pdf, false, "Write .pdf output file", this->params())
352 , BOOL_MEMBER(textonly_pdf, false, "Create PDF with only one invisible text layer",
353 this->params())
354 , INT_MEMBER(jpg_quality, 85, "Set JPEG quality level", this->params())
355 , INT_MEMBER(user_defined_dpi, 0, "Specify DPI for input image", this->params())
356 , INT_MEMBER(min_characters_to_try, 50, "Specify minimum characters to try during OSD",
357 this->params())
358 , STRING_MEMBER(unrecognised_char, "|", "Output char for unidentified blobs", this->params())
359 , INT_MEMBER(suspect_level, 99, "Suspect marker level", this->params())
360 , INT_MEMBER(suspect_short_words, 2, "Don't suspect dict wds longer than this", this->params())
361 , BOOL_MEMBER(suspect_constrain_1Il, false, "UNLV keep 1Il chars rejected", this->params())
362 , double_MEMBER(suspect_rating_per_ch, 999.9, "Don't touch bad rating limit", this->params())
363 , double_MEMBER(suspect_accept_rating, -999.9, "Accept good rating limit", this->params())
364 , BOOL_MEMBER(tessedit_minimal_rejection, false, "Only reject tess failures", this->params())
365 , BOOL_MEMBER(tessedit_zero_rejection, false, "Don't reject ANYTHING", this->params())
366 , BOOL_MEMBER(tessedit_word_for_word, false, "Make output have exactly one word per WERD",
367 this->params())
368 , BOOL_MEMBER(tessedit_zero_kelvin_rejection, false, "Don't reject ANYTHING AT ALL",
369 this->params())
370 , INT_MEMBER(tessedit_reject_mode, 0, "Rejection algorithm", this->params())
371 , BOOL_MEMBER(tessedit_rejection_debug, false, "Adaption debug", this->params())
372 , BOOL_MEMBER(tessedit_flip_0O, true, "Contextual 0O O0 flips", this->params())
373 , double_MEMBER(tessedit_lower_flip_hyphen, 1.5, "Aspect ratio dot/hyphen test", this->params())
374 , double_MEMBER(tessedit_upper_flip_hyphen, 1.8, "Aspect ratio dot/hyphen test", this->params())
375 , BOOL_MEMBER(rej_trust_doc_dawg, false, "Use DOC dawg in 11l conf. detector", this->params())
376 , BOOL_MEMBER(rej_1Il_use_dict_word, false, "Use dictword test", this->params())
377 , BOOL_MEMBER(rej_1Il_trust_permuter_type, true, "Don't double check", this->params())
378 , BOOL_MEMBER(rej_use_tess_accepted, true, "Individual rejection control", this->params())
379 , BOOL_MEMBER(rej_use_tess_blanks, true, "Individual rejection control", this->params())
380 , BOOL_MEMBER(rej_use_good_perm, true, "Individual rejection control", this->params())
381 , BOOL_MEMBER(rej_use_sensible_wd, false, "Extend permuter check", this->params())
382 , BOOL_MEMBER(rej_alphas_in_number_perm, false, "Extend permuter check", this->params())
383 , double_MEMBER(rej_whole_of_mostly_reject_word_fract, 0.85, "if >this fract", this->params())
384 , INT_MEMBER(tessedit_image_border, 2, "Rej blbs near image edge limit", this->params())
385 , STRING_MEMBER(ok_repeated_ch_non_alphanum_wds, "-?*\075", "Allow NN to unrej", this->params())
386 , STRING_MEMBER(conflict_set_I_l_1, "Il1[]", "Il1 conflict set", this->params())
387 , INT_MEMBER(min_sane_x_ht_pixels, 8, "Reject any x-ht lt or eq than this", this->params())
388 , BOOL_MEMBER(tessedit_create_boxfile, false, "Output text with boxes", this->params())
389 , INT_MEMBER(tessedit_page_number, -1, "-1 -> All pages, else specific page to process",
390 this->params())
391 , BOOL_MEMBER(tessedit_write_images, false, "Capture the image from the IPE", this->params())
392 , BOOL_MEMBER(interactive_display_mode, false, "Run interactively?", this->params())
393 , STRING_MEMBER(file_type, ".tif", "Filename extension", this->params())
394 , BOOL_MEMBER(tessedit_override_permuter, true, "According to dict_word", this->params())
395 , STRING_MEMBER(tessedit_load_sublangs, "", "List of languages to load with this one",
396 this->params())
397 , BOOL_MEMBER(tessedit_use_primary_params_model, false,
398 "In multilingual mode use params model of the"
399 " primary language",
400 this->params())
401 , double_MEMBER(min_orientation_margin, 7.0, "Min acceptable orientation margin",
402 this->params())
403 , BOOL_MEMBER(textord_tabfind_show_vlines, false, "Debug line finding", this->params())
404 , BOOL_MEMBER(textord_use_cjk_fp_model, false, "Use CJK fixed pitch model", this->params())
405 , BOOL_MEMBER(poly_allow_detailed_fx, false,
406 "Allow feature extractors to see the original outline", this->params())
407 , BOOL_INIT_MEMBER(tessedit_init_config_only, false,
408 "Only initialize with the config file. Useful if the "
409 "instance is not going to be used for OCR but say only "
410 "for layout analysis.",
411 this->params())
412 #ifndef DISABLED_LEGACY_ENGINE
413 , BOOL_MEMBER(textord_equation_detect, false, "Turn on equation detector", this->params())
414 #endif // ndef DISABLED_LEGACY_ENGINE
415 , BOOL_MEMBER(textord_tabfind_vertical_text, true, "Enable vertical detection", this->params())
416 , BOOL_MEMBER(textord_tabfind_force_vertical_text, false, "Force using vertical text page mode",
417 this->params())
418 , double_MEMBER(textord_tabfind_vertical_text_ratio, 0.5,
419 "Fraction of textlines deemed vertical to use vertical page "
420 "mode",
421 this->params())
422 , double_MEMBER(textord_tabfind_aligned_gap_fraction, 0.75,
423 "Fraction of height used as a minimum gap for aligned blobs.", this->params())
424 , INT_MEMBER(tessedit_parallelize, 0, "Run in parallel where possible", this->params())
425 , BOOL_MEMBER(preserve_interword_spaces, false, "Preserve multiple interword spaces",
426 this->params())
427 , STRING_MEMBER(page_separator, "\f", "Page separator (default is form feed control character)",
428 this->params())
429 , INT_MEMBER(lstm_choice_mode, 0,
430 "Allows to include alternative symbols choices in the hOCR output. "
431 "Valid input values are 0, 1 and 2. 0 is the default value. "
432 "With 1 the alternative symbol choices per timestep are included. "
433 "With 2 alternative symbol choices are extracted from the CTC "
434 "process instead of the lattice. The choices are mapped per "
435 "character.",
436 this->params())
437 , INT_MEMBER(lstm_choice_iterations, 5,
438 "Sets the number of cascading iterations for the Beamsearch in "
439 "lstm_choice_mode. Note that lstm_choice_mode must be set to a "
440 "value greater than 0 to produce results.",
441 this->params())
442 , double_MEMBER(lstm_rating_coefficient, 5,
443 "Sets the rating coefficient for the lstm choices. The smaller the "
444 "coefficient, the better are the ratings for each choice and less "
445 "information is lost due to the cut off at 0. The standard value is "
446 "5",
447 this->params())
448 , BOOL_MEMBER(pageseg_apply_music_mask, false,
449 "Detect music staff and remove intersecting components", this->params())
450 ,
451
452 backup_config_file_(nullptr)
453 , pix_binary_(nullptr)
454 , pix_grey_(nullptr)
455 , pix_original_(nullptr)
456 , pix_thresholds_(nullptr)
457 , source_resolution_(0)
458 , textord_(this)
459 , right_to_left_(false)
460 , scaled_color_(nullptr)
461 , scaled_factor_(-1)
462 , deskew_(1.0f, 0.0f)
463 , reskew_(1.0f, 0.0f)
464 , gradient_(0.0f)
465 , most_recently_used_(this)
466 , font_table_size_(0)
467 #ifndef DISABLED_LEGACY_ENGINE
468 , equ_detect_(nullptr)
469 #endif // ndef DISABLED_LEGACY_ENGINE
470 , lstm_recognizer_(nullptr)
471 , train_line_page_num_(0) {}
472
473 Tesseract::~Tesseract() {
474 Clear();
475 pix_original_.destroy();
476 end_tesseract();
477 for (auto *lang : sub_langs_) {
478 delete lang;
479 }
480 delete lstm_recognizer_;
481 lstm_recognizer_ = nullptr;
482 }
483
484 Dict &Tesseract::getDict() {
485 if (0 == Classify::getDict().NumDawgs() && AnyLSTMLang()) {
486 if (lstm_recognizer_ && lstm_recognizer_->GetDict()) {
487 return *lstm_recognizer_->GetDict();
488 }
489 }
490 return Classify::getDict();
491 }
492
493 void Tesseract::Clear() {
494 std::string debug_name = imagebasename + "_debug.pdf";
495 pixa_debug_.WritePDF(debug_name.c_str());
496 pix_binary_.destroy();
497 pix_grey_.destroy();
498 pix_thresholds_.destroy();
499 scaled_color_.destroy();
500 deskew_ = FCOORD(1.0f, 0.0f);
501 reskew_ = FCOORD(1.0f, 0.0f);
502 gradient_ = 0.0f;
503 splitter_.Clear();
504 scaled_factor_ = -1;
505 for (auto &sub_lang : sub_langs_) {
506 sub_lang->Clear();
507 }
508 }
509
510 #ifndef DISABLED_LEGACY_ENGINE
511
512 void Tesseract::SetEquationDetect(EquationDetect *detector) {
513 equ_detect_ = detector;
514 equ_detect_->SetLangTesseract(this);
515 }
516
517 // Clear all memory of adaption for this and all subclassifiers.
518 void Tesseract::ResetAdaptiveClassifier() {
519 ResetAdaptiveClassifierInternal();
520 for (auto &sub_lang : sub_langs_) {
521 sub_lang->ResetAdaptiveClassifierInternal();
522 }
523 }
524
525 #endif // ndef DISABLED_LEGACY_ENGINE
526
527 // Clear the document dictionary for this and all subclassifiers.
528 void Tesseract::ResetDocumentDictionary() {
529 getDict().ResetDocumentDictionary();
530 for (auto &sub_lang : sub_langs_) {
531 sub_lang->getDict().ResetDocumentDictionary();
532 }
533 }
534
535 void Tesseract::SetBlackAndWhitelist() {
536 // Set the white and blacklists (if any)
537 unicharset.set_black_and_whitelist(tessedit_char_blacklist.c_str(),
538 tessedit_char_whitelist.c_str(),
539 tessedit_char_unblacklist.c_str());
540 if (lstm_recognizer_) {
541 UNICHARSET &lstm_unicharset = lstm_recognizer_->GetUnicharset();
542 lstm_unicharset.set_black_and_whitelist(tessedit_char_blacklist.c_str(),
543 tessedit_char_whitelist.c_str(),
544 tessedit_char_unblacklist.c_str());
545 }
546 // Black and white lists should apply to all loaded classifiers.
547 for (auto &sub_lang : sub_langs_) {
548 sub_lang->unicharset.set_black_and_whitelist(tessedit_char_blacklist.c_str(),
549 tessedit_char_whitelist.c_str(),
550 tessedit_char_unblacklist.c_str());
551 if (sub_lang->lstm_recognizer_) {
552 UNICHARSET &lstm_unicharset = sub_lang->lstm_recognizer_->GetUnicharset();
553 lstm_unicharset.set_black_and_whitelist(tessedit_char_blacklist.c_str(),
554 tessedit_char_whitelist.c_str(),
555 tessedit_char_unblacklist.c_str());
556 }
557 }
558 }
559
560 // Perform steps to prepare underlying binary image/other data structures for
561 // page segmentation.
562 void Tesseract::PrepareForPageseg() {
563 textord_.set_use_cjk_fp_model(textord_use_cjk_fp_model);
564 // Find the max splitter strategy over all langs.
565 auto max_pageseg_strategy = static_cast<ShiroRekhaSplitter::SplitStrategy>(
566 static_cast<int32_t>(pageseg_devanagari_split_strategy));
567 for (auto &sub_lang : sub_langs_) {
568 auto pageseg_strategy = static_cast<ShiroRekhaSplitter::SplitStrategy>(
569 static_cast<int32_t>(sub_lang->pageseg_devanagari_split_strategy));
570 if (pageseg_strategy > max_pageseg_strategy) {
571 max_pageseg_strategy = pageseg_strategy;
572 }
573 sub_lang->pix_binary_.destroy();
574 sub_lang->pix_binary_ = pix_binary().clone();
575 }
576 // Perform shiro-rekha (top-line) splitting and replace the current image by
577 // the newly split image.
578 splitter_.set_orig_pix(pix_binary());
579 splitter_.set_pageseg_split_strategy(max_pageseg_strategy);
580 if (splitter_.Split(true, &pixa_debug_)) {
581 ASSERT_HOST(splitter_.splitted_image());
582 pix_binary_.destroy();
583 pix_binary_ = splitter_.splitted_image().clone();
584 }
585 }
586
587 // Perform steps to prepare underlying binary image/other data structures for
588 // OCR. The current segmentation is required by this method.
589 // Note that this method resets pix_binary_ to the original binarized image,
590 // which may be different from the image actually used for OCR depending on the
591 // value of devanagari_ocr_split_strategy.
592 void Tesseract::PrepareForTessOCR(BLOCK_LIST *block_list, Tesseract *osd_tess, OSResults *osr) {
593 // Find the max splitter strategy over all langs.
594 auto max_ocr_strategy = static_cast<ShiroRekhaSplitter::SplitStrategy>(
595 static_cast<int32_t>(ocr_devanagari_split_strategy));
596 for (auto &sub_lang : sub_langs_) {
597 auto ocr_strategy = static_cast<ShiroRekhaSplitter::SplitStrategy>(
598 static_cast<int32_t>(sub_lang->ocr_devanagari_split_strategy));
599 if (ocr_strategy > max_ocr_strategy) {
600 max_ocr_strategy = ocr_strategy;
601 }
602 }
603 // Utilize the segmentation information available.
604 splitter_.set_segmentation_block_list(block_list);
605 splitter_.set_ocr_split_strategy(max_ocr_strategy);
606 // Run the splitter for OCR
607 bool split_for_ocr = splitter_.Split(false, &pixa_debug_);
608 // Restore pix_binary to the binarized original pix for future reference.
609 ASSERT_HOST(splitter_.orig_pix());
610 pix_binary_.destroy();
611 pix_binary_ = splitter_.orig_pix().clone();
612 // If the pageseg and ocr strategies are different, refresh the block list
613 // (from the last SegmentImage call) with blobs from the real image to be used
614 // for OCR.
615 if (splitter_.HasDifferentSplitStrategies()) {
616 BLOCK block("", true, 0, 0, 0, 0, pixGetWidth(pix_binary_), pixGetHeight(pix_binary_));
617 Image pix_for_ocr = split_for_ocr ? splitter_.splitted_image() : splitter_.orig_pix();
618 extract_edges(pix_for_ocr, &block);
619 splitter_.RefreshSegmentationWithNewBlobs(block.blob_list());
620 }
621 // The splitter isn't needed any more after this, so save memory by clearing.
622 splitter_.Clear();
623 }
624
625 } // namespace tesseract